Telephone circuit-changer



3 Sheets Sheet '1.

l l l L l l k I l I (No M0691.) E

O. D. HA SKINS.

' TELEPHONE CIRCUIT CHANGER. E No. 293.171. 3 Patented Feb. 5, 1884;

Inventor Mjvbnesses 5% Z (No Model.) a Sheets-QSheet 2 0. D. HASKINS.

TELEPHONE CIRCUIT CHANGER.

N0. 293,1.71. Patented Feb. 5-, 1884.,

% jnv enio-r y /WJ N. PETEns. Pmmmm n hn. Washington. ac.

3 Sheets-Sheet 3.

(No Model.)

0. 1). HASKINS; TELEPHONE CIRCUIT CHANGER.

Patented Feb. 5. 1884.

\Q ht a S L w WW UNIITIED STATES PATENT @rrrbn.

CHARLES E. HASKINS, OF NEW YORK, N. Y., ASSIGNOR, BY MEsnE nssren- MENTS, To THE wEsTEEn ELECTRIC COMPANY, on CHICAGO, ILLINOIS.

TELEPHONE Cl RCUIT-CH ANGER.

SPECIFICATION forming part of Letters Patent No. 293,171, dated February 5, 1 884.

Applicnlion filed February 9, 1881. (No model.)

.To all whom it may concern: ,be sent along the tOlGlJilOllB-llllOfl, which finds Be it known that I, CrmnLEs D. HASKINS, circuits through the switch asifollows: by. a citizenof the United States, residing at the bolt 7) to plate thence to lover or key (1, city of New York, in the county of New York which is held in contact with insulated conand State of New York, have invented certain tact stop or pointe by spiral spring f. Line 9 5 a new and useful Improvements in Telephone is connected from point 6 through an annun- Circuit-Changers, of which the following is a ciator, and thence by wire h to ground. When full, clear, concise, and exact description, refthe switch is connected with the operators crence being had to theaccompanying drawtelephone, or with the switch of another tele- 1o ing's, forming a part of this specification. phone-line, by placing the eyelet of the tip of 6c My invention is designed to facilitate the the single conducting-cord upon the hook '11, work of switching at the central oflice of a as indicated by dotted lines, the position of telephone-exchange, and is an improvement the lever is changed and its cont-act with point upon the jackknife switch heretofore used 6 broken. In Fig. 4, Sheet 2, the telephone- I H 1 upon the general switch-board. Each subline Z connects with bolt m, which connects p I scriber is connected by an independent telewith spring or key a, which is in contact with w phoneline with a switch upon the general contact stop or point 0. Line 1) is connected switch-board, which passes from said switch from point 0 through an annunciator, and through an 'annunciator and thence to ground. thence by wire q to ground. hen the eyelet 2c The final connection between any two teleof a cord-tip is placed upon the hook r, the phone-lines is made by a flexible conducting contact between a and point 0 is broken and cord connected from one of the switches to the ,a new contact formed between the spring and other. A complete metallic circuithas been the metallic tip of the cord. The double used for each terminal station, in which case switch shown in Fig. 3 consists of springs s the circuit, instead of passing to ground, as and s and stopst and t. The complete metal- 7 5 before described, would pass back to the terlie circuit is, as indicated, from the terminal minal station through the annunciator and station of a subscriber to-spring s, which is in anothenswitch, which should be placed upon contact with stop If, and from stop 2, after the switch-board near the first switch of said passing through an annnnciator, to stop t, and .30 circuit. Instead oftwo switches for each comfrom spring .s" back to the terminal station. plete metallic circuit, a single double switch, By means of a flexible doubleconducting-cord ashereinafter shown, maybeuscd. My switch provided with suitable tips, the metallic cirmay also be used where-a part of the telephonecuits of two such switches may be formed into lines are open at the central office. one metallic circuit passing from one terminal 3 5 In the drawings, Figure 1, Sheet 1, shows a station through the central office to the other front elevation of a switch embodying my imterminal station, and thence back through the y I provements. Fig. 2 is a section thereof upon central office to the first terminal station.

q line a: m of Fig. 1. Fig. 3, Sheet 2, shows a Vhen the eyelet a of the rubber block of the l switch-board with modifications of my switch. tip (see Fig. 6) is forced upon the hook of a 40 Fig. 4 is a section of Fig. 3 upon line 3 9 double switch, the two springs of the switch 0 'Fig. 5 shows an end of a single flexible 0011- are sprung back from contact-with their redueting-eo'rd provided with a metallic tip. speetive stops, and the metallic points '0 o are Fig. 6 shows an end of a double flexible conbrought into contact with the springs. W'hen ducting-cord provided with metallic tips, each it is desired to connect a double switch with a 45 connected with a single strand of the cord, and single switch, the tip at one end of the double 5 Fig. 7 shows a single and double line conconducting-cord should be like the one shown nected. v I in Fig. 6, while each of the other ends of the Thefcentral office may be notified in any of strands, or at least one of them, should be pro the well-known ways what connection is de vided with a tip like the one shown in Fig. 5. 5o sired. For example, an electric current may The double-pointed tip is placed upon the I09 2 wanna.

hook of the double switch, as before described, and one of the strands of the cord connected by means of its single tip with the single switch, while the other strand is connected to ground. Thus the circuit of the two terminal stations is as follows: from the ground of the first terminal station to the spring of the single switch, and thence through one strand of the cord to one spring of the double switch; thence through the outfit at the second terminal station and back to theother spring of said double switch, and from last-mentioned spring through the other strand of the double conducting-cord to ground.

In Sheet 3, Fig. 7, I have shown two subscribers. stations, A and B, thus connected together through the central otfice, O, by means of my switching ,apparatus. The telephone line Z of station A is connected to spring at of the single switch at the central ol'fice, and thence, as shown, through one strand of the cord to spring 8 of the double switch, and thence through the outfit at station B and back to the other spring, 8, of the double switch, and thence to ground at the central office through the other strand of the cord, as shown.

I claim as my invention and desire to secure by Letters Patent- 1. The combination of spring at, stop 0, and hook r, or their equivalents, with a flexible conducting-cord, substantially as and for the purpose specified.

2. The tip of a double conducting-cord, con sisting of a rubber block provided with eyelet a and contact-points v and 1), each connecting with a strand of the cord, substantially as and for the purpose specified.

3. The combination, at the central office of a telephone-exchange, of the single switch and A and the metallic circuit of station B may be united to form a single ground-cireuit, substantially as and for the purpose specified.

- CHAS. D. HASKINS.

itnes ses:

R. S. ITAYYVARD, Josnrrr BIRD.

0 the double switch, and means, as described, v whereby the single telephone-line of station 

